In reality, this should have been re-factored to the dev db.
If it couldn't be, the junior dev should have been given access to the raids table alone for writes.
Lastly the developer who didn't back up this table is the MOST to blame. Money was paid for the state in that table. That means people TRUST you to keep it safe.
I count tons of people to blame here. I don't really see the junior dev as one of them.